A steel ladder transfer device for cable bundle burning test

Abstract

The application discloses a steel ladder transfer device for cable bundle combustion test, which comprises a transfer device main body composed of a head end support, a tail end support and a scissor type telescopic device, a steel ladder head end fixing seat is arranged on the head end support to fix the head end of the steel ladder on the head end support, a steel ladder locking device is arranged on the tail end support to be automatically unlocked when the included angle between the steel ladder and a horizontal plane is greater than a set unlocking angle, the tail end support moves to the head end support under the pulling action of the tail end of the steel ladder when the head end of the steel ladder is hoisted upward, and the tail end of the steel ladder is separated from the tail end support when the included angle between the steel ladder and the horizontal plane reaches the set unlocking angle. During the process that the steel ladder transfer device for cable bundle combustion test enters a test box in an inclined state, the tail end of the steel ladder is supported, the labor intensity of workers is effectively reduced, the safety of operation is improved, and the steel ladder transfer device has the advantages of simple structure, small occupied space, easy operation, high reliability and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable bundle burning test, in particular to a transfer device for transferring the steel ladder of bundled cable into the burning test box during the cable bundle burning test. BACKGROUND

[0002] The cable bundle burning test is to simulate the environment of the electric wire and cable under the real fire condition, and to comprehensively understand the performance of the cable under the fire condition by measuring the propagation speed of the flame, the generation of the smoke and the burning characteristics of the electric wire and cable, so as to provide a strong basis for evaluating the fire performance of the electric wire and cable and improving the design and manufacturing of the electric wire and cable. According to the standard of GB / T18380.31-2008, the electric cable needs to be bundled on the steel ladder with a length of 3500mm during the cable bundle burning test, and then the steel ladder is vertically fixed in the test box for the burning test. The weight of the steel ladder after bundling the electric cable usually reaches several hundred kilograms, and there is no special device for transferring the steel ladder after bundling the electric cable into the test box in the prior art, and the manual operation mode of lifting and carrying the steel ladder to the test box is usually adopted, and then the first end of the steel ladder is lifted by the lifting device in the test box, so that the steel ladder enters the test box in an inclined state, and is finally fixed vertically in the test box. Since the test requires that the distance between the steel ladder and the rear wall of the test box is 150mm, a plurality of support legs with a length of 150mm need to be arranged on the side of the steel ladder facing the rear wall. During the lifting process of the first end of the steel ladder, in order to prevent the support legs from being scratched by contacting the ground, a plurality of workers need to continuously lift the tail end of the steel ladder away from the ground and move with the tail end of the steel ladder to the door of the test box. This process not only has a large labor intensity of the workers, but also the steel ladder is easy to fall off, and even accidents may occur, which endangers the personal safety of the workers. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a cable bundle burning test steel ladder transfer device, which can conveniently transfer the steel ladder after bundling the electric cable to the test box, and can provide support for the tail end of the steel ladder during the process of the steel ladder entering the test box in an inclined state, so as to effectively reduce the labor intensity of the workers and improve the safety of the operation. The cable bundle burning test steel ladder transfer device of the present application also has the advantages of simple structure, small occupied space, easy operation, high reliability and the like.

[0004] The technical scheme adopted for solving the technical problem: a steel ladder transfer device for cable bunching combustion test, comprising a transfer device main body composed of a head end support, a tail end support and a scissor folding device, the head end support is used for bearing and limiting the head end of the steel ladder, a steel ladder head end fixing seat is arranged on the head end support to fix the head end of the steel ladder on the head end support, an upward-opening U-shaped groove is arranged on the steel ladder head end fixing seat, during horizontal transfer of the steel ladder, the transverse short rod of the head end of the steel ladder is seated in the U-shaped groove, and a castor is arranged at the bottom of the head end support; the tail end support is used for bearing and locking the tail end of the steel ladder, a steel ladder locking device is arranged on the tail end support to be automatically unlocked when the included angle between the steel ladder and the horizontal plane is greater than a set unlocking angle, when the head end of the steel ladder is hoisted upward, the tail end support moves toward the head end support under the pulling action of the tail end of the steel ladder, when the included angle between the steel ladder and the horizontal plane reaches the set unlocking angle, the tail end of the steel ladder is unlocked from the tail end support, the tail end of the steel ladder is separated from the tail end support, and the tail end support stops moving, and a castor is arranged at the bottom of the tail end support; the scissor folding device is used for connecting the head end support and the tail end support, so that the head end support and the tail end support always remain in an upright state, and the tail end support is contracted and constrained to only move toward the head end support during hoisting of the head end of the steel ladder.

[0005] As a further improved scheme of the present application: a steel ladder plug-in pipe seat is arranged on the tail end support, the tail end of the steel ladder plug-in pipe seat is hinged on the tail end support through a pin shaft, and the tail end of the longitudinal long rod of the steel ladder is constrained in the steel ladder plug-in pipe seat before the steel ladder tail end is unlocked.

[0006] As a further improved scheme of the present application: the steel ladder locking device comprises an arc-shaped latch installed on the tail end support, the axis of the arc-shaped latch coincides with the axis of the hinge pin of the steel ladder plug-in pipe seat, pin holes matched with the arc-shaped latch are respectively arranged on the steel ladder plug-in pipe seat and the tail end of the longitudinal long rod of the steel ladder, during hoisting of the steel ladder, when the rotation angle of the steel ladder plug-in pipe seat is greater than the central angle of the arc-shaped latch, the locking between the steel ladder plug-in pipe seat and the longitudinal long rod of the steel ladder is unlocked, the tail end of the longitudinal long rod of the steel ladder slides along the axis of the steel ladder plug-in pipe and finally separates from the steel ladder plug-in pipe seat.

[0007] As a further improved scheme of the present application: the arc-shaped latch is movably installed on the tail end support, an arc-shaped latch insertion hole is arranged on the tail end support, and a fixing pin hole is respectively arranged on the lower part of the arc-shaped latch and the tail end support, the arc-shaped latch is fixed in the arc-shaped latch insertion hole through the fixing pin.

[0008] As a further improvement of the present application: the steel ladder locking device comprises a transverse short rod vertical guide seat installed on the tail end support, a vertical guide surface slidingly matched with the transverse short rod is arranged on the vertical guide seat, the distance from the lower end of the vertical guide surface to the hinged pin shaft at the tail end of the steel ladder insertion pipe seat is less than the sum of the length from the front edge of the transverse short rod at the tail end of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinged pin shaft at the tail end of the steel ladder insertion pipe seat to the head end of the steel ladder insertion pipe seat, and the distance from the upper end of the vertical guide surface to the hinged pin shaft at the tail end of the steel ladder insertion pipe seat is greater than the sum of the length from the front edge of the transverse short rod at the tail end of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinged pin shaft at the tail end of the steel ladder insertion pipe seat to the head end of the steel ladder insertion pipe seat.

[0009] As a further improvement of the present application: the vertical guide seat is a rotatable L-shaped vertical guide seat composed of a vertical guide column and a horizontal fixed seat, a rotating shaft hole is arranged at the connecting part of the horizontal fixed seat and the vertical guide column, a fixed hole is arranged at the end of the horizontal fixed seat, the L-shaped vertical guide seat is installed on the tail end support through a guide seat shaft, a lock hole matched with the fixed hole is also arranged on the tail end support, and the L-shaped vertical guide seat keeps the vertical guide column in a vertical state through a movable lock pin.

[0010] As a further improvement of the present application: two sets of parallel steel ladder locking devices are arranged on the head end support and the tail end support.

[0011] As a further improvement of the present application: the steel ladder locking device comprises a permanent magnet hoist hinged at one end on the bottom surface of the tail end support platform and rotatable with the steel ladder during the hoisting of the head end of the steel ladder, a steel ladder insertion pipe seat is arranged on the magnetic attraction surface of the permanent magnet hoist, the steel ladder insertion pipe seat is a blind pipe welded on the magnetic attraction surface of the permanent magnet hoist near the hinged shaft end, a permanent magnet hoist passing window is arranged on the platform, only the main body of the permanent magnet hoist can pass through the platform during the rotation of the permanent magnet hoist, while the handle is always prevented on the bottom surface of the platform, the included angle between the opening block position and the closing block position of the handle of the permanent magnet hoist is equal to the steel ladder unlocking angle, so that the handle is rotated to the closing block position when the permanent magnet hoist is rotated to the steel ladder unlocking angle, and the locking of the tail end of the steel ladder is released.

[0012] As a further improvement of the present application: two sets of identical scissors-type telescopic devices are arranged between the head end support and the tail end support, the head end support and the tail end support respectively comprise two columns and a crossbeam connecting the columns, a sliding sleeve is arranged on each column, and the static arm at the end of the scissors-type telescopic device is hinged on the column, and the dynamic arm is hinged on the sliding sleeve.

[0013] As a further improvement of the present application: a plurality of horizontal connecting shafts connecting the corresponding fork shafts in the two sets of scissors-type telescopic devices are arranged between the two sets of scissors-type telescopic devices.

[0014] As a further improvement of the application: the caster is a universal caster installed at the lower end of the stand column, and the universal caster at the lower end of the first end support stand column is a universal caster with a parking brake.

[0015] Beneficial effects: the cable bundle combustion test steel ladder transfer device of the application, since the transfer device comprises a transfer device main body composed of a first end support, a tail end support and a scissor type telescopic device, a steel ladder first end fixing seat is arranged on the first end support to fix the first end of the steel ladder on the first end support, a steel ladder locking device is arranged on the tail end support to be automatically unlocked when the included angle between the steel ladder and the horizontal plane is greater than the set unlocking angle, and a caster is arranged on the bottom of the first end support and the tail end support, so that in the process of the cable bundle combustion test steel ladder transfer device entering the test box in the inclined state of the steel ladder, the tail end support can move to the test box door under the pulling action of the steel ladder until the tail end of the steel ladder is separated from the tail end support when the included angle between the steel ladder and the horizontal plane reaches the preset unlocking angle, so that the worker can replace the steel ladder tail end to move along with the steel ladder, which not only effectively reduces the labor intensity of the worker, but also reduces the risk of accidents and improves the safety of operation. The cable bundle combustion test steel ladder transfer device of the application also has the advantages of simple structure, small occupied space after contraction, easy operation and the like. Since the tail end of the steel ladder is constrained in the steel ladder plug-in pipe seat by the steel ladder locking device before the tail end of the steel ladder is unlocked, on the one hand, the tail end of the steel ladder is more easily and quickly placed on the tail end support, and on the other hand, during the hoisting of the first end of the steel ladder, the rotating shaft of the steel ladder is always located behind the tail end of the steel ladder, so that the lower end of the support leg of the tail end of the steel ladder can be raised above the upper fork shaft of the scissor type telescopic device as soon as possible, thereby avoiding interference with the upper fork shaft of the scissor type telescopic device. In addition, during the process of moving the steel ladder out of the test box after the combustion test is completed, the tail end of the steel ladder can be quickly plugged into the steel ladder plug-in pipe seat, and with the descending of the first end of the steel ladder, the tail end support is pushed away from the test box door by the steel ladder, the scissor type telescopic device is unfolded, and finally the first end of the steel ladder is horizontally placed on the first end support, so that the steel ladder is moved away from the test box. Since the steel ladder locking device comprises an arc-shaped latch mounted on the tail end support, and the tail end of the steel ladder plug-in pipe seat and the steel longitudinal long rod are respectively provided with a pin hole matched with the arc-shaped latch, during the hoisting of the steel ladder, when the rotating angle of the steel ladder plug-in pipe seat is greater than the central angle of the arc-shaped latch, the arc-shaped latch slides out of the pin hole, the locking between the steel ladder plug-in pipe seat and the steel longitudinal long rod is released, and the tail end of the steel longitudinal long rod slides along the steel ladder plug-in pipe axis and finally separates from the steel ladder plug-in pipe seat. The structure of this locking device is simple, the locking effect of the steel ladder is good, and the reliability is high. Since the arc-shaped latch is movably mounted on the tail end support, the arc-shaped latch insertion hole is formed in the tail end support, and the fixed pin hole is formed in the lower part of the arc-shaped latch and the tail end support, and the arc-shaped latch is fixed in the arc-shaped latch insertion hole through the fixed pin, after the steel ladder with bound cables is placed on the transfer device, the arc-shaped latch can be conveniently inserted into the tail end support from top to bottom through the pin holes of the steel ladder and the steel ladder plug-in pipe seat and quickly fixed, so that the operation is more convenient.The steel ladder tail end horizontal short rod vertical guide seat is provided with a vertical guide surface in sliding cooperation with the horizontal short rod, the distance from the lower end of the vertical guide surface to the hinge pin shaft at the tail end of the steel ladder insertion pipe seat is less than the sum of the length from the front edge of the steel ladder tail end horizontal short rod to the tail end of the steel ladder longitudinal long rod and the length from the hinge pin shaft at the tail end of the steel ladder insertion pipe seat to the head end of the steel ladder insertion pipe seat, and the distance from the upper end of the vertical guide surface to the hinge pin shaft at the tail end of the steel ladder insertion pipe seat is greater than the sum of the length from the front edge of the steel ladder tail end horizontal short rod to the tail end of the steel ladder longitudinal long rod and the length from the hinge pin shaft at the tail end of the steel ladder insertion pipe seat to the head end of the steel ladder insertion pipe seat, so that the frictional resistance between the steel ladder tail end horizontal short rod and the vertical guide seat is smaller during the hoisting of the steel ladder head end, and the steel ladder longitudinal long rod tail end can be first separated from the steel ladder insertion pipe seat, and then the steel ladder tail end horizontal short rod is separated from the vertical guide surface, so that the steel ladder longitudinal long rod tail end is effectively prevented from being stuck with the steel ladder insertion pipe seat and being difficult to separate, the process of the steel ladder vertical rising is more stable, and the reliability is higher. The vertical guide seat is an L-shaped vertical guide seat which can rotate and is composed of a vertical guide column and a horizontal fixed seat, a rotating shaft hole is arranged at the connecting part between the horizontal fixed seat and the vertical guide column, a fixed hole is arranged at the end of the horizontal fixed seat, the L-shaped vertical guide seat is installed on the tail end support through a guide seat shaft, a lock hole matched with the fixed hole is also arranged on the tail end support, and the L-shaped vertical guide seat keeps the vertical guide column in a vertical state through a movable lock pin, so that the vertical guide column can be kept in a vertical state after the steel ladder placed on the transfer device is bound with cables, and the falling operation of the steel ladder is more favorable. Two sets of steel ladder locking devices are arranged on the head end support and the tail end support respectively, so that the steel ladder locking effect is better, and the stress on the tail end support is more uniform during the hoisting of the steel ladder head end. Two sets of scissor-type telescopic devices are arranged between the head end support and the tail end support, the head end support and the tail end support each include two columns and a cross beam connecting the columns, a sliding sleeve is arranged on each column, a static arm at the end of the scissor-type telescopic device is hinged to the column, a dynamic arm is hinged to the sliding sleeve, and a plurality of horizontal connecting shafts connecting corresponding fork shafts are arranged between the two sets of scissor-type telescopic devices, so that the connection between the head end support and the tail end support is more firm, the telescopic device is more stable in contraction and expansion, and the cable bundle combustion test steel ladder transfer device has higher bearing capacity. The casters are universal casters installed at the lower ends of the columns, and the universal casters at the lower ends of the head end support columns are universal casters with parking brakes, so that the movement, turning and parking of the cable bundle combustion test steel ladder transfer device are more flexible and stable. BRIEF DESCRIPTION OF DRAWINGS

[0016] The cable bundle combustion test steel ladder transfer device will be further described below with reference to the drawings.

[0017] Figure 1 is the structural diagram of the steel ladder for cable bundle burning test;

[0018] Figure 2 is the structural diagram of the steel ladder for cable bundle burning test;

[0019] Figure 3 is Figure 2 is the enlarged structural diagram of the steel ladder locking device in the steel ladder transfer device for cable bundle burning test;

[0020] Figure 4 is the structural diagram of another embodiment of the steel ladder transfer device for cable bundle burning test in the expanded state;

[0021] Figure 5 is Figure 4 is the enlarged structural diagram of the steel ladder locking device in the steel ladder transfer device for cable bundle burning test;

[0022] Figure 6 is the structural diagram of another embodiment of the steel ladder transfer device for cable bundle burning test in the expanded state;

[0023] Figure 7 is Figure 6 is the enlarged structural diagram of the steel ladder locking device in the steel ladder transfer device for cable bundle burning test;

[0024] Figure 8 is Figure 6 is the enlarged structural diagram of the steel ladder locking device in the steel ladder transfer device for cable bundle burning test;

[0025] Figure 9 is Figure 2 is the structural diagram of the steel ladder transfer device for cable bundle burning test in the contraction process. DETAILED DESCRIPTION

[0026] As shown in Figure 1 , the steel ladder 1 for cable bundle burning test is composed of two longitudinal long rods 11 with a length of 3500 mm and a plurality of transverse short rods 12, 13. A plurality of support legs 14 with a length of 150 mm are welded at the lower part of the steel ladder, and a lifting ring 15 is arranged at the head end of the steel ladder. For the convenience of description, the head end of the steel ladder is defined as "front" and the reverse direction is "back" in the following examples.

[0027] As shown in Figure 2 , Figure 9 , the steel ladder transfer device for cable bundle burning test of the present application comprises a transfer device main body composed of a head end support 2, a tail end support 4 and a scissor folding device 3.

[0028] The head end support is welded by two columns 21, horizontal beams 24 and 25 connecting the two columns and a platform 23. The tail end support is welded by two columns 41, horizontal beams 44 and 45 connecting the two columns and a platform 43. The bottom of the head end support and the tail end support is respectively provided with a caster 26, which is a universal caster installed at the lower end of the column. The universal caster at the lower end of the column of the head end support is a universal caster with a parking brake. A sliding sleeve 31 is installed on each column. The static arm 32 of the scissor folding device is hinged on the column, and the dynamic arm 33 is hinged on the sliding sleeve.

[0029] The head end support is used to carry and define the head end of the steel ladder. A steel ladder head end fixing seat 22 is arranged on the head end support to fix the head end of the steel ladder on the head end support. An upward U-shaped slot is arranged on the steel ladder head end fixing seat. During the horizontal transfer of the steel ladder, the transverse short rod of the head end of the steel ladder is seated in the U-shaped slot.

[0030] The tail end support is used to carry and lock the tail end of the steel ladder. A steel ladder locking device 5 is arranged on the tail end support to automatically unlock when the included angle between the steel ladder and the horizontal plane is greater than a set unlocking angle. When the head end of the steel ladder is hoisted upward, the tail end support moves toward the head end support under the pulling action of the tail end of the steel ladder. When the included angle between the steel ladder and the horizontal plane reaches the set unlocking angle, the tail end of the steel ladder is unlocked from the tail end support, the tail end of the steel ladder is separated from the tail end support, and the tail end support stops moving.

[0031] The scissor folding device is used to connect the head end support and the tail end support, so that the head end support and the tail end support always remain in an upright state. During the hoisting of the head end of the steel ladder, the tail end support is contracted and constrained to move only toward the head end support.

[0032] A steel ladder insertion pipe seat 42 is arranged on the tail end support. The inner diameter of the steel ladder insertion pipe seat is 1-5 mm larger than the diameter of the longitudinal long rod of the steel ladder. The tail end of the steel ladder insertion pipe seat is hinged on the tail end support through a pin shaft 46. Before the tail end of the steel ladder is unlocked, the tail end of the longitudinal long rod of the steel ladder is constrained in the steel ladder insertion pipe seat by the steel ladder locking device.

[0033] As shown in Figure 3 The steel ladder locking device includes an arc-shaped latch 51 installed on the tail end support. The axis of the arc-shaped latch coincides with the axis of the hinging pin shaft of the steel ladder insertion pipe seat. Pin holes 15' matched with the arc-shaped latch are respectively arranged on the steel ladder insertion pipe seat and the tail end of the longitudinal long rod of the steel ladder. The pin holes are slightly larger than the cross section of the arc-shaped latch to ensure that the arc-shaped latch can smoothly enter and exit the pin holes. During the hoisting of the steel ladder, when the rotation angle of the steel ladder insertion pipe seat is greater than the central angle of the arc-shaped latch, the locking between the steel ladder insertion pipe seat and the longitudinal long rod of the steel ladder is released. The tail end of the longitudinal long rod of the steel ladder slides along the axis of the steel ladder insertion pipe and finally separates from the steel ladder insertion pipe seat.

[0034] Preferably, the arc-shaped plug-in is movably mounted on the tail end support, the arc-shaped plug-in mounting hole is formed on the tail end support, the fixed pin hole is formed on the lower part of the arc-shaped plug-in and the tail end support respectively, and the arc-shaped plug-in is fixed in the arc-shaped plug-in mounting hole by the fixed pin 52.

[0035] Preferably, two sets of parallel steel ladder locking devices are arranged on the head end support and the tail end support.

[0036] Preferably, two sets of identical scissors-type telescopic devices are arranged between the head end support and the tail end support, and a plurality of horizontal connecting shafts 34 connecting corresponding fork shafts are arranged between the two sets of scissors-type telescopic devices.

[0037] Figure 4 、 Figure 5 Another embodiment of the steel ladder transfer device for cable bundle combustion test of the present application is shown, the steel ladder locking device comprises a transverse short rod vertical guide seat 53 mounted on the tail end support of the steel ladder, a vertical guide surface 531 slidingly matched with the transverse short rod is arranged on the vertical guide seat, the distance from the lower end of the vertical guide surface to the hinged pin shaft at the tail end of the steel ladder plug-in pipe seat is less than the sum of the length L from the front edge 16 of the tail end transverse short rod of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinged pin shaft at the tail end of the steel ladder plug-in pipe seat to the head end of the steel ladder plug-in pipe seat, and the distance from the upper end of the vertical guide surface to the hinged pin shaft at the tail end of the steel ladder plug-in pipe seat is greater than the sum of the length from the front edge of the tail end transverse short rod of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinged pin shaft at the tail end of the steel ladder plug-in pipe seat to the head end of the steel ladder plug-in pipe seat.

[0038] Preferably, the vertical guide seat is a rotatable L-shaped vertical guide seat composed of a vertical guide column and a horizontal fixed seat, a rotating shaft hole is arranged at the connection part of the horizontal fixed seat and the vertical guide column, a fixed hole is arranged at the end of the horizontal fixed seat, the L-shaped vertical guide seat is mounted on the tail end support by the guide seat shaft 54, a lock hole matched with the fixed hole is formed on the tail end support, and the vertical guide column is kept in a vertical state by the movable lock pin 55. When the tail end of the steel ladder does not need to be locked, the L-shaped vertical guide seat can be rotated around the guide seat shaft, at this time, the steel ladder can be conveniently moved, when locking is needed, the movable lock pin is inserted, the position of the tail end transverse short rod of the steel ladder is limited by the vertical guide column, and the tail end of the longitudinal long rod of the steel ladder can only be separated from the bundle of the steel ladder plug-in pipe seat before reaching the unlocking angle, so that the locking and unlocking of the steel ladder by the mechanical device are realized.

[0039] Figure 6Another embodiment of the cable-bundling fire test steel ladder transfer device of the present application is shown, the steel ladder locking device includes a permanent magnet hoist 57 hinged at one end to the bottom surface of the tail end support platform, which can rotate with the steel ladder during the lifting process of the head end of the steel ladder, a permanent magnet hoist passing window 46 is opened on the platform, which allows only the main body of the permanent magnet hoist to pass through the platform during the rotation of the permanent magnet hoist, while the handle 58 is always prevented from being on the bottom surface of the platform, the angle between the opening block and the closing block of the handle of the permanent magnet hoist is equal to the unlocking angle of the steel ladder, so that when the permanent magnet hoist rotates to the unlocking angle of the steel ladder, the handle rotates to the closing block, and the locking of the tail end of the steel ladder is released. Using this permanent magnet hoist as a steel ladder locking device, the tail end of the steel ladder is attracted by the permanent magnet hoist, and the steel ladder and the permanent magnet hoist rotate together around the hinge axis 59 of the permanent magnet hoist during the lifting process of the steel ladder, the tail end of the steel ladder pulls the tail end support to move forward, and when the steel ladder reaches the unlocking angle, the permanent magnet hoist can instantly release the locking of the tail end of the steel ladder. A steel ladder insertion pipe seat is provided on the magnetic attraction surface of the permanent magnet hoist, and the steel ladder insertion pipe seat is a blind pipe 56 welded on the magnetic attraction surface of the permanent magnet hoist near the hinge axis end.

[0040] The cable bundle combustion test steel ladder transfer device of the application is used in the following way: first, unfold the cable bundle combustion test steel ladder transfer device, then place the steel ladder horizontally on the cable bundle combustion test steel ladder transfer device, with the longitudinal long rod tail end of the steel ladder inserted into the steel ladder insertion pipe seat, the horizontal short rod of the steel ladder head seated in the U-shaped groove of the steel ladder head fixing seat of the head support, the cable to be tested for combustion tied to the steel ladder, the arc-shaped latch or L-shaped vertical guide seat for locking the tail end of the steel ladder installed in place, the cable bundle combustion test steel ladder transfer device pushed to the test box door, with the lower end of the head support resting outside the test box door sill, and the universal wheel parking brake at the lower end of the head support locked to prevent the head support from moving, the hook in the test box hooked to the head end of the steel ladder, and the head end of the steel ladder slowly lifted, at this time, since the tail end of the steel ladder is locked to the tail end support, as the head end of the steel ladder is lifted, the tail end of the steel ladder pulls the tail end support, causing the tail end support to move towards the test box door, and the scissor folding device retracts, when the steel ladder and the horizontal plane reach the set unlocking angle, usually set to 50-80 degrees, the steel ladder locking device automatically unlocks, the steel ladder separates from the tail end support, the tail end support no longer moves forward, and the tail end of the steel ladder enters the test box. After the combustion test is completed, the tail end of the steel ladder is pulled out of the test box, the longitudinal long rod tail end of the steel ladder is inserted into the steel ladder insertion pipe seat of the tail end support, the hook is released, and the head end of the steel ladder slowly descends, since the universal wheel at the lower end of the head support is locked by the parking brake, the tail end support moves away from the test box door under the pushing action of the steel ladder, the scissor folding device expands until the steel ladder is horizontally placed on the cable bundle combustion test steel ladder transfer device, the parking brake of the universal wheel at the lower end of the head support is released, and the cable bundle combustion test steel ladder transfer device is moved away from the test box together with the steel ladder. Since the locking and unlocking are completed by mechanical structures, the cable bundle combustion test steel ladder transfer device of the application can withstand high temperatures, resist interference, and has higher reliability.

Claims

1. A steel ladder transfer device for cable bundle combustion testing, comprising a main body of the transfer device consisting of a head support, a tail support, and a scissor telescopic device, characterized in that: The first end support is used for bearing and limiting the first end of the steel ladder, and a first end fixing seat for fixing the first end of the steel ladder on the first end support is arranged on the first end support, an upward U-shaped slot is arranged on the first end fixing seat, during horizontal transfer of the steel ladder, the transverse short rod of the first end of the steel ladder is seated in the U-shaped slot, and a castor is arranged on the bottom of the first end support; the tail end support is used for bearing and locking the tail end of the steel ladder, a steel ladder locking device which is automatically unlocked when the included angle between the steel ladder and the horizontal plane is greater than a set unlocking angle is arranged on the tail end support, when the first end of the steel ladder is hoisted upward, the tail end support moves toward the first end support under the pulling action of the tail end of the steel ladder, when the included angle between the steel ladder and the horizontal plane reaches the set unlocking angle, the tail end of the steel ladder is unlocked from the tail end support, the tail end of the steel ladder is separated from the tail end support, and the tail end support stops moving, and a castor is arranged on the bottom of the tail end support; the scissor-type telescopic device is used for connecting the first end support and the tail end support, so that the first end support and the tail end support always keep an upright state, and the tail end support is contracted and constrained to move only toward the first end support during hoisting of the first end of the steel ladder.

2. The steel ladder transfer device for cable bundling combustion test according to claim 1, wherein a steel ladder insertion pipe seat is arranged on the tail end support, the tail end of the steel ladder insertion pipe seat is hingedly connected to the tail end support through a pin shaft, and the tail end of the longitudinal long rod of the steel ladder is constrained in the steel ladder insertion pipe seat before the tail end of the steel ladder is unlocked.

3. The steel ladder transfer device for cable bundle burning tests according to claim 2, characterized in that: The steel ladder locking device comprises an arc-shaped latch installed on the tail end support, the axis of the arc-shaped latch coincides with the axis of the hinging pin shaft of the steel ladder insertion pipe seat, pin holes matched with the arc-shaped latch are respectively arranged on the steel ladder insertion pipe seat and the tail end of the longitudinal long rod of the steel ladder, and when the steel ladder is hoisted, the tail end of the longitudinal long rod of the steel ladder slides along the axis of the steel ladder insertion pipe and finally separates from the steel ladder insertion pipe seat when the angle of rotation of the steel ladder insertion pipe seat is greater than the central angle of the arc-shaped latch.

4. The steel ladder transfer device for cable bundle burning tests according to claim 3, characterized in that: The arc-shaped latch is movably installed on the tail end support, an arc-shaped latch insertion hole is arranged on the tail end support, and fixed pin holes are respectively arranged on the lower part of the arc-shaped latch and the tail end support, and the arc-shaped latch is fixed in the arc-shaped latch insertion hole through the fixed pin.

5. The steel ladder transfer device for cable bundle burn testing of claim 2, wherein: The steel ladder locking device comprises a vertical guide seat of the transverse short rod of the tail end of the steel ladder installed on the tail end support, a vertical guide surface slidably matched with the transverse short rod is arranged on the vertical guide seat, the distance from the lower end of the vertical guide surface to the hinging pin shaft of the tail end of the steel ladder insertion pipe seat is less than the sum of the length from the leading edge of the tail end of the transverse short rod of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinging pin shaft of the tail end of the steel ladder insertion pipe seat to the first end of the steel ladder insertion pipe seat, and the distance from the upper end of the vertical guide surface to the hinging pin shaft of the tail end of the steel ladder insertion pipe seat is greater than the sum of the length from the leading edge of the tail end of the transverse short rod of the steel ladder to the tail end of the longitudinal long rod of the steel ladder and the length from the hinging pin shaft of the tail end of the steel ladder insertion pipe seat to the first end of the steel ladder insertion pipe seat.

6. The steel ladder transfer device for cable bundle burning tests according to claim 5, characterized in that: The vertical guiding seat is a rotatable L-shaped vertical guiding seat composed of a vertical guiding column and a horizontal fixing seat, a rotating shaft hole is arranged at the connecting part of the horizontal fixing seat and the vertical guiding column, a fixing hole is arranged at the end of the horizontal fixing seat, the L-shaped vertical guiding seat is installed on the tail end support through a guiding seat shaft, a lock hole matched with the fixing hole is also arranged on the tail end support, and the L-shaped vertical guiding seat keeps the vertical guiding column in a vertical state through a movable lock pin.

7. A steel ladder transfer device for cable bundle burning tests according to any one of claims 1 to 6, characterized in that: Two sets of steel ladder locking devices arranged in parallel are arranged on the head end support and the tail end support.

8. The steel ladder transfer device for cable bundle burning tests according to claim 7, characterized in that: Two sets of identical scissor folding devices are arranged between the head end support and the tail end support, the head end support and the tail end support respectively include two columns and a crossbeam connecting the columns, a sliding sleeve is arranged on each column, a static supporting arm at the end of the scissor folding device is hinged to the column, a dynamic supporting arm is hinged to the sliding sleeve, and a plurality of horizontal connecting shafts connecting corresponding fork shafts in the two sets of scissor folding devices are arranged between the two sets of scissor folding devices.

9. The steel ladder transfer device for cable bundle burning tests according to claim 8, characterized in that: The casters are universal casters installed at the lower ends of the columns, and the universal casters at the lower ends of the columns of the head end support are universal casters with parking brakes.

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